US4905227A - Circuit for subscriber line interface circuits in a digital time-division multiplex communication switching center - Google Patents
Circuit for subscriber line interface circuits in a digital time-division multiplex communication switching center Download PDFInfo
- Publication number
- US4905227A US4905227A US07/163,484 US16348488A US4905227A US 4905227 A US4905227 A US 4905227A US 16348488 A US16348488 A US 16348488A US 4905227 A US4905227 A US 4905227A
- Authority
- US
- United States
- Prior art keywords
- subscriber line
- interface circuits
- line interface
- bus conductor
- switching center
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/005—Interface circuits for subscriber lines
Definitions
- the invention relates to a circuit for subscriber line interface circuits in a digital time-division multiplex communication switching center over which a connection is established to four wire bus conductors of the time-multiplex communication switching center during respective allocated time slots.
- a circuit for subscriber line interface circuits in a digital time-division multiplex communication switching center establishes a connection with a four wire bus conductor of the time-multiplex communication switching center during respective allocated time slots.
- the circuit provides access to receivers of related subscriber line interface circuits from the bus conductor for the simultaneous reception of the same information by a number of subscriber interface circuits, and their associated subscriber terminal devices respectively, during the same time slots, while at the same time preventing access of the transmit driver stages of these subscriber line interface circuits to the bus conductor.
- the subscriber line interface circuits include separate modules for the time slot allocation and for the connection to the bus conductor.
- the prevention of access of the transmit driver stage of the subscriber line interface circuit to the bus conductor in this embodiment results when the final stages of the transmit amplifiers of these components are placed in the high impedance state.
- separate switching components are coupled between the above modules and the bus conductor.
- the transmit driver stages are connected to the bus conductor through the switches, which are opened when it is desired to prevent access by the transmit driver stages.
- FIGS. 1 and 2 of an exemplary embodiment A more detailed description of the invention follows below through reference to FIGS. 1 and 2 of an exemplary embodiment.
- FIG. 1 shows the interconnection circuitry of a time-division multiplex switching center. Subscriber terminal equipment devices TE are connected to this switching center through the subscriber loops TL.
- FIG. 2 shows another embodiment of the invention described with reference to FIG. 1 where separate switching components are included.
- the subscriber line interconnection circuitry comprises individual subscriber line interface circuits SLIC as well as associated dual subscriber terminal equipment modules ALAP.
- Some of the so-called BORSCHT-functions in particular, the function of the subscriber power supply (Battery), the (Overvoltage) protection, the (Ringing) power supply, the signaling and line status monitoring (Signals, Supervision) and the two wire-four wire transition (Hybrid), are provided by the SLIC module.
- the remainder of the BORSCHT-functions are provided by the ALAP modules, i.e. the analog-digital conversion (Coding) as well as the filter functions required in this connection.
- the two bus conductors PCMA and PCMB each with a transmitting branch T and a receiving branch R, respectively, are connected to the ALAP modules.
- These bus conductors provide a connection to the switching matrix of the switching facility (not shown) to which the illustrated interconnection circuitry, is related.
- the ALAP contains devices for time slot allocation and for optional connection of the SLICs to the bus conductors PCMA and PCMB.
- the SLIC and ALAP modules of the illustrated interconnection circuitry area are under the control of a group control (not shown) serving a number of subscriber line interconnection circuits.
- the same receiving time slot is allocated to the selected receivers of the subscriber line interconnection circuits via the respective ALAP module.
- the danger of transmissions being made to the same time slot from a number of subscriber line interconnection circuits, with resulting damage to the final driver stages of the transmitters is then unavoidable, if the number of subscriber line interconnection circuits which are to receive information simultaneously, is greater than the number of time slots established on the bus conductors (32 or 64 depending on the design modification).
- connection of the transmit driver stages of the selected subscriber line interconnection circuits to the bus conductor during such broadcasting is prevented.
- This can be brought about by placing the transmit driver stages of the ALAP modules, through which connection to the bus conductors is established, in the high impedance state.
- FIG. 2 wherein like elements have like designations, separate switching components coupled between the modules and the bus conductor are illustrated wherein the switching components are opened selectively to prevent access by the transmit driver stages.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Time-Division Multiplex Systems (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3707500 | 1987-03-09 | ||
DE3707500 | 1987-03-09 | ||
DE3711030 | 1987-04-02 | ||
DE3711030 | 1987-04-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4905227A true US4905227A (en) | 1990-02-27 |
Family
ID=25853264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/163,484 Expired - Fee Related US4905227A (en) | 1987-03-09 | 1988-03-03 | Circuit for subscriber line interface circuits in a digital time-division multiplex communication switching center |
Country Status (9)
Country | Link |
---|---|
US (1) | US4905227A (fr) |
EP (1) | EP0281888B1 (fr) |
JP (1) | JPH0693796B2 (fr) |
BR (1) | BR8801017A (fr) |
DE (1) | DE3875139D1 (fr) |
DK (1) | DK123588A (fr) |
FI (1) | FI881072A (fr) |
GR (1) | GR3006696T3 (fr) |
PT (1) | PT86916B (fr) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5459713A (en) * | 1991-05-24 | 1995-10-17 | Digital Equipment Corporation | Self-configuring data communication system and method |
US5497370A (en) * | 1988-11-16 | 1996-03-05 | Hitachi, Ltd. | Network system |
US5612954A (en) * | 1994-04-29 | 1997-03-18 | Telefonaktiebolaget Lm Ericsson | Time switch system |
US6582513B1 (en) | 1998-05-15 | 2003-06-24 | Apollo Diamond, Inc. | System and method for producing synthetic diamond |
US20030131787A1 (en) * | 1998-05-15 | 2003-07-17 | Linares Robert C. | Tunable CVD diamond structures |
US20050181210A1 (en) * | 2004-02-13 | 2005-08-18 | Doering Patrick J. | Diamond structure separation |
US20060261349A1 (en) * | 1998-05-15 | 2006-11-23 | Doering Patrick J | Single crystal diamond electrochemical electrode |
CN100423526C (zh) * | 2004-03-22 | 2008-10-01 | Ut斯达康通讯有限公司 | 一种保证本地交换机正常工作的方法 |
EP2189555A2 (fr) | 2001-08-08 | 2010-05-26 | Apollo Diamond, Inc. | systeme et procede de prodution de diamant synthetique |
US20100150338A1 (en) * | 2008-12-17 | 2010-06-17 | Silicon Laboratories, Inc. | Circuit device with serial bus isolation |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0779344B2 (ja) * | 1988-05-13 | 1995-08-23 | 山武ハネウエル株式会社 | 半2重通信路ドライバ制御方法 |
IT1252125B (it) * | 1991-10-23 | 1995-06-05 | Sgs Thomson Microelectronics | Metodo e dispositivo circuitale per misurare in condizioni di esercizio parametri operativi di un circuito di interfaccia e di una linea telefonica d'utente ad esse collegata |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4631534A (en) * | 1984-11-13 | 1986-12-23 | At&T Information Systems Inc. | Distributed packet switching system |
US4654890A (en) * | 1984-09-05 | 1987-03-31 | Hitachi, Ltd. | Multiplex communication system |
US4740955A (en) * | 1986-10-29 | 1988-04-26 | Tie/Communications, Inc. | Communications system having voice and digital data capability and employing a plurality of voice and data buses in main service unit and serial packetized transmission to and from telephones |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2915488C2 (de) * | 1979-04-17 | 1982-05-19 | Nixdorf Computer Ag, 4790 Paderborn | Schaltungsanordnung zur Steuerung der Übertragung von Digital-Signalen, insbesondere PCM-Signalen, zwischen Anschlußstellen eines Zeitmultiplex-Fernmeldenetzes, insbesondere PCM-Zeitmultiplex-Fernmeldenetzes |
US4541087A (en) * | 1983-06-27 | 1985-09-10 | Confertech International, Inc. | Digital teleconferencing control device, system and method |
US4570258A (en) * | 1984-02-13 | 1986-02-11 | Wang Laboratories, Inc. | Exchange switch |
-
1988
- 1988-02-29 EP EP88103015A patent/EP0281888B1/fr not_active Expired - Lifetime
- 1988-02-29 DE DE8888103015T patent/DE3875139D1/de not_active Expired - Fee Related
- 1988-03-02 JP JP63047685A patent/JPH0693796B2/ja not_active Expired - Lifetime
- 1988-03-03 US US07/163,484 patent/US4905227A/en not_active Expired - Fee Related
- 1988-03-08 PT PT86916A patent/PT86916B/pt not_active IP Right Cessation
- 1988-03-08 FI FI881072A patent/FI881072A/fi not_active IP Right Cessation
- 1988-03-08 BR BR8801017A patent/BR8801017A/pt not_active IP Right Cessation
- 1988-03-08 DK DK123588A patent/DK123588A/da not_active Application Discontinuation
-
1992
- 1992-12-30 GR GR920402441T patent/GR3006696T3/el unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4654890A (en) * | 1984-09-05 | 1987-03-31 | Hitachi, Ltd. | Multiplex communication system |
US4631534A (en) * | 1984-11-13 | 1986-12-23 | At&T Information Systems Inc. | Distributed packet switching system |
US4740955A (en) * | 1986-10-29 | 1988-04-26 | Tie/Communications, Inc. | Communications system having voice and digital data capability and employing a plurality of voice and data buses in main service unit and serial packetized transmission to and from telephones |
Non-Patent Citations (2)
Title |
---|
AMD Product Specifications; "AM 7901 Subscriber Line Audio-Processing Circuit"; Apr. 1983. |
AMD Product Specifications; AM 7901 Subscriber Line Audio Processing Circuit ; Apr. 1983. * |
Cited By (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5497370A (en) * | 1988-11-16 | 1996-03-05 | Hitachi, Ltd. | Network system |
US5459713A (en) * | 1991-05-24 | 1995-10-17 | Digital Equipment Corporation | Self-configuring data communication system and method |
US5612954A (en) * | 1994-04-29 | 1997-03-18 | Telefonaktiebolaget Lm Ericsson | Time switch system |
US20050109266A1 (en) * | 1998-05-15 | 2005-05-26 | Apollo Diamond, Inc. | Arc jet microwave plasma method of growing single crystal diamond |
US8974599B2 (en) | 1998-05-15 | 2015-03-10 | SCIO Diamond Technology Corporation | Boron doped single crystal diamond electrochemical synthesis electrode |
US20050109265A1 (en) * | 1998-05-15 | 2005-05-26 | Apollo Diamond, Inc. | Single crystal synthetic diamond |
US6858080B2 (en) | 1998-05-15 | 2005-02-22 | Apollo Diamond, Inc. | Tunable CVD diamond structures |
US20050056206A1 (en) * | 1998-05-15 | 2005-03-17 | Apollo Diamond, Inc. | Single crystal diamond having 12C, 13C, and phosphorous |
US20050056209A1 (en) * | 1998-05-15 | 2005-03-17 | Apollo Diamond, Inc. | Method of creating a synthetic diamond |
US20050056207A1 (en) * | 1998-05-15 | 2005-03-17 | Apollo Diamond, Inc. | Single crystal diamond tool |
US20050056208A1 (en) * | 1998-05-15 | 2005-03-17 | Apollo Diamond, Inc. | Synthetic diamond having alternating layers with different concentrations of impurities |
US20050061233A1 (en) * | 1998-05-15 | 2005-03-24 | Apollo Diamond, Inc. | Method of forming an N-type doped single crystal diamond |
US20050066884A1 (en) * | 1998-05-15 | 2005-03-31 | Apollo Diamond, Inc. | Method of growing a single crystal diamond |
US20050085079A1 (en) * | 1998-05-15 | 2005-04-21 | Apollo Diamond, Inc. | Method of growing boron doped single crystal diamond in a plasma reactor |
US20050109268A1 (en) * | 1998-05-15 | 2005-05-26 | Apollo Diamond, Inc. | Single crystal diamond tool |
US20050109264A1 (en) * | 1998-05-15 | 2005-05-26 | Apollo Diamond, Inc. | Method of growing a single crystal diamond |
US6582513B1 (en) | 1998-05-15 | 2003-06-24 | Apollo Diamond, Inc. | System and method for producing synthetic diamond |
US20030205190A1 (en) * | 1998-05-15 | 2003-11-06 | Linares Management Associates, Inc. | System and method for producing synthetic diamond |
US20050109267A1 (en) * | 1998-05-15 | 2005-05-26 | Apollo Diamond, Inc. | Method of growing single crystal diamond in a plasma reactor |
US20030131787A1 (en) * | 1998-05-15 | 2003-07-17 | Linares Robert C. | Tunable CVD diamond structures |
US20050109262A1 (en) * | 1998-05-15 | 2005-05-26 | Apollo Diamond, Inc. | Boron doped single crystal diamond electrochemical synthesis electrode |
US20060261349A1 (en) * | 1998-05-15 | 2006-11-23 | Doering Patrick J | Single crystal diamond electrochemical electrode |
US7201886B2 (en) | 1998-05-15 | 2007-04-10 | Apollo Diamond, Inc. | Single crystal diamond tool |
US7258741B2 (en) | 1998-05-15 | 2007-08-21 | Apollo Diamond, Inc. | System and method for producing synthetic diamond |
US8591856B2 (en) | 1998-05-15 | 2013-11-26 | SCIO Diamond Technology Corporation | Single crystal diamond electrochemical electrode |
US7459024B2 (en) | 1998-05-15 | 2008-12-02 | Apollo Diamond, Inc. | Method of forming an N-type doped single crystal diamond |
US7560086B2 (en) | 1998-05-15 | 2009-07-14 | Apollo Diamond, Inc. | Single crystal diamond having 12C, 13C, and phosphorous |
US8187380B2 (en) | 1998-05-15 | 2012-05-29 | Apollo Diamond, Inc | Method of growing single crystal diamond in a plasma reactor |
US7942966B2 (en) | 1998-05-15 | 2011-05-17 | Apollo Diamond, Inc. | Method of growing boron doped single crystal diamond in a plasma reactor |
EP2189555A2 (fr) | 2001-08-08 | 2010-05-26 | Apollo Diamond, Inc. | systeme et procede de prodution de diamant synthetique |
US20050181210A1 (en) * | 2004-02-13 | 2005-08-18 | Doering Patrick J. | Diamond structure separation |
CN100423526C (zh) * | 2004-03-22 | 2008-10-01 | Ut斯达康通讯有限公司 | 一种保证本地交换机正常工作的方法 |
US20100150338A1 (en) * | 2008-12-17 | 2010-06-17 | Silicon Laboratories, Inc. | Circuit device with serial bus isolation |
US8150028B2 (en) | 2008-12-17 | 2012-04-03 | Silicon Laboratories, Inc. | Circuit device with serial bus isolation |
Also Published As
Publication number | Publication date |
---|---|
BR8801017A (pt) | 1988-10-11 |
EP0281888B1 (fr) | 1992-10-07 |
DE3875139D1 (de) | 1992-11-12 |
DK123588A (da) | 1988-09-10 |
GR3006696T3 (fr) | 1993-06-30 |
JPS63234799A (ja) | 1988-09-30 |
PT86916A (pt) | 1989-03-30 |
DK123588D0 (da) | 1988-03-08 |
FI881072A (fi) | 1988-09-10 |
JPH0693796B2 (ja) | 1994-11-16 |
EP0281888A3 (en) | 1989-11-02 |
EP0281888A2 (fr) | 1988-09-14 |
PT86916B (pt) | 1995-03-31 |
FI881072A0 (fi) | 1988-03-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SIEMENS AKTIENGESELLSCHAFT, BERLIN AND MUNICH, GER Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:LECHNER, ROBERT;WINGERATH, NORBERT;REEL/FRAME:004900/0110 Effective date: 19880428 Owner name: SIEMENS AKTIENGESELLSCHAFT, A CORP. OF GERMANY,GER Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LECHNER, ROBERT;WINGERATH, NORBERT;REEL/FRAME:004900/0110 Effective date: 19880428 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 19980304 |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |